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Latest Articles

How To Use Zimbra Postscreen? | Zimbra

In this article, you will learn about using and configuring Zimbra Postscreen. Zimbra Postscreen Zimbra Postscreen is an anti-bot/dos started in Zimbra 8.7. It tackles mail server overload by keeping...
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What Is Zimbra Postscreen? | Zimbra

In this article, you will learn about Zimbra Postscreen and how it works. Zimbra Postscreen Zimbra Postscreen is an anti-bot/dos started in Zimbra 8.7. It tackles mail server overload by...
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How to Verify Your rDNS Record | Zimbra

rDNS Record Verification Assuming you have already created your rDNS record, added it to your DNS, and want to check your rDNS configuration. The rDNS record is stored in DNS...
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How to Verify Your DMARC Record | Zimbra

DMARC Record Verification Assuming you have already created your DMARC rule, added it to your DNS, and want to check your SPF configuration. The DMARC record is stored in DNS...
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How to Verify Your SPF Record | Zimbra

SPF Record Verification Assuming you have already created your SPF rule, added it to your DNS, and want to check your SPF configuration. The SPF record is stored in DNS...
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How to Verify Your DKIM Signature | Zimbra

DKIM Signature Verification for Outgoing Emails Assuming you have already created your DKIM data, added them to your DNS, and want to verify your DKIM configuration for signing outgoing emails....
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How To Configure Zimbra rDNS? | Zimbra

The rDNS or reverse DNS resolves the domain name associated with an IP as opposed to DNS which resolves the IP associated with a domain name. This can be used...
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How To Configure Zimbra DMARC? | Zimbra

DMARC or Domain-based Message Authentication, Reporting, and Conformance is an email authentication, policy, and reporting protocol that defines how your email servers should manage your SPF and DKIM. DMARC protects your domain...
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How To Configure Zimbra SPF to Check Incoming Emails? | Zimbra

SPF or Sender Policy Framework is an email authentication method that identifies which mail servers are allowed to send emails on behalf of your domain. I can forge an email header to...
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How To Configure Zimbra SPF for Outgoing Emails? | Zimbra

SPF or Sender Policy Framework is an email authentication method that identifies which mail servers are allowed to send emails on behalf of your domain. I can forge an email header to...
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How To Configure Zimbra DKIM to Check Incoming Emails? | Zimbra

DKIM or DomainKeys Identified Mail is an email authentication method that tries to identify email spoofing attempts (creation of email messages with a forged sender address). DKIM enables you as the receiver of the email to verify...
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How To Configure Zimbra DKIM to Sign Outgoing Emails? | Zimbra

DKIM or DomainKeys Identified Mail is an email authentication method that tries to identify email spoofing attempts (creation of email messages with a forged sender address). DKIM enables you as the receiver of the email to verify...
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Email Protection Routines | Zimbra

After installing Zimbra Collaboration Suite, there are some configurations you may want to set up in order to improve the security of sending emails to other email systems. Phishing and...
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Installing DNS Server on CentOS/RHEL using dnsmasq | Zimbra

This article will show you how to install and configure a DNS server using dnsmasq on CentOS 7 / RHEL 7 / CentOS 8 / RHEL 8. This will be...
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Setting up a Static IP Address on CentOS / RHEL | Zimbra

This guide will show you different ways to set up a static IP address on your CentOS/RHEL Linux server. Before you start First of all we need to get the...
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SELinux | Zimbra

Security-Enhanced Linux (SELinux) is a mandatory access control (MAC) security mechanism implemented in the kernel. SELinux was first introduced in CentOS 4 and significantly enhanced in later CentOS releases. In...
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Zextras Drive | Zimbra

Zextras Drive is a Zimbra component that provides both a complete file storage system integrated with the Zimbra WebClient and a replacement to the old "Briefcase" component. Zextras Drive is...
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QR Authentication for mobile apps | Zimbra

QR Code authentication for mobile apps ( such as Team App and Drive App ) is part of Zextras Auth and can speed up and manage login to those application.  The first...
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